Agitator



Nov. 4, 1930. J. E. BOND 1,180,166

AGITATOR Filed March 14, 1928 lfldezzrr 5 Patented Nov. 4, 1930 1,7s0,1ea

JOSEPH E. BOND, or ArrLE'roN, wIsooNsIiI AG-ITATOR Application filed March 14, 1922. serial no. 261,555.

My invention relates to the art of paper making and particularly to a novel pump arrangement for handling pulp.

It is desirable, and in fact essential, that the material delivered to the Fourdriniers shall be of uniform consistency and that it shall be delivered in substantially uniform volume regardless of the head of material in the storage tanks.- A centrifugal pump is a desired instrumentality for use in the stuff delivery, but a drawback in the use of this type of pump is that it requires acertain minimum head of material for'operation to avoid becoming air bound. It frequently happens that the quantity of material in the storage tank will fall below that required to furnish the requisite head for proper operation.

In order to avoid this difliculty, and to combine in a simple mechanism means for agi- 539 tating with the other feature, I have utilized the device herein illustrated. It comprises a large storage tank having a pump, preferably of screw type located at one end thereof, the inlet to the pump being at a low point in the tank at one end, while the discharge is at a higher point near the opposite end. Con

nected to the discharge from the pump is the intake to a centrifugal pump, both pumps being operate-d from the same motor driven 3-1) shaft. Consequently whenever there is ma terial in the tank up to the level of the intake of the screw pump, it will be operated on by the pump and a head created equal to the height of the outlet. Therefore, the cen- B 2 trifugal pump will always be operating under substantially uniform head regardless-of the quantity of material in the tank.

The invention will be more'readily understood by reference to the accompanying drawing, in which the figure is an elevation, partly in section, showing a pump arrangement in accordance with my invention.

In the drawing I have illustrated a tank preferably composed of concrete and having 4 side walls 10 and an end wall 11. Mounted outside of the tank on a base 12 is a screw pump having an impeller 13, the intake being through the L 14; which extends through the end Wall 11 of the tank. A discharge pipe 15 5 extends upwardly from the pump and thence laterally terminating in a- T 16, at a'reniote point-in the tank. p I V A centrifugal pump 17 is mounted on the base 12 in axial alignment with the screw pump, both being operated by the shaft 18 operated by motor 19-. Thee-ye of the centrifugal is in direct communication with the discharge from the screw pump by means of the conical connection 20. Assuming a level bf liquid in the tank at the point of the dotted line 21 and wit-h the motor in operation, pulp is drawn in through the intake by the impeller 13, a head being developed sufficient to elevate the liquid to the level of the discharge T 16. This head is effective in the centrifugal pump which is continuously operated and a desired quantity of such liquid passes out through the outlet 22 from the centrifugal to the paper machines. 7 A further advantage in the arrangement is that the material afterit passes through the screw pump has been thoroughly agitated and the particles separated and in a proper state of suspension Within the liquid. It is, therefore, in ideal condition for immediate de livery to the machines. At this point a portion of the material passing through the screw pump is taken by the centrifugal and delivered as required.

I claim 2 1. In combination, a storage tank, an agitating pump associated therewith, said pump developing a minimum head of the liquid treated, and a centrifugal pump connected to the outlet from the circulating pump, said centrifugal pump operating under the head created by said agitating pump'and serving to withdraw a quantity of the liquid for a specified use. 7

' 2. The combination with a pulp storage tank of a pump for circulating the pulp within said tank, and a centrifugal pump directly connected to the outlet from said circulating pump, said centrifugal pump delivering a portion only of'the circulating pulp for a desired use.

3. In combination, a storage tank, a pump for agitating and circulating the pulp Within said tank and for maintaining a minimum head at the outlet from said pump, and a centrifugal pump, the outlet from which is directly connected to the outlet of said circulating pump, said centrifugal pump withdrawing a portion only of the circulated pulp.

4:. In combination, a tank, a circulating pump exterior thereof, said pump having an inlet connected to a low point in the tank and an outlet connected to a higher point in the tank, a centrifugal pump axially aligned with said circulating pump, the inlet to the centrifugal pump being directly connected to the outlet from the circulating pump, and a motor for operating both pumps.

.5. In combination, a tank, a pulp circulating pump having an inlet and an outlet in communication with said tank, a centrifugal pump the eye of which is in communication and in axial alignment with the impeller of the circulating pump and a single motor for operating both said pumps.

In testimony whereof I have affixed my signature.

7 JOSEPH E. BOND. 

